Time-controlled switch mechanism for electric circuits.



H. B. MUCABE... Y TIME GONTROLLED SWITCH MEGHANISM EUR ELECTRIC CIRCUITS.

APPLICATION FILED 00T. 10, 1912.

1,129,996. Patented Mar. 2, 1915.

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TIME coNTRoLLBD SWITCH MEGHANISM TOR ELECTRIC CIRCUITS.

APPLICATION FILED 0GT.10, 1912.

1,1 29,996. Patented Mar. 2, 1915.

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TIME CONTROLLED SWITCH MEGHANISM FOR ELECTRIC CIRCUITS.

APPLICATION FILED 00T. 10, 1912.

1,129,996. Patented Mar. 2, 1915.

4 SHEETS-SHEET 3.

Hf B. MGGABB. TIME CONTROLLED SWITCH MECHANISM FOR ELECTRIC CIRCUITS. 4

APPLICATION FILED CCT. I0, 1912.

1,129,996- Patented Mar. 2, 1915.

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To dzlhfwhom it 'may concern AIiism .forelectri'c circuits which shall have neurone. menen, for cerca-ee,

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IOF MADISON, 'WISGDNSIN, .A CQRPOR'BIQN 0F WISCQNSIN.

TIME-CONTROLLED SWITCH MECENSM FR EIIECTRIC CRCUITS animation aleactohar mista. .seminosaaaara Y Be it known that .L'Honaon LB. .MCCABE, a .citizen lof .thelUnited States, .residing at Chicago, in the county of @ook and State of Illinois, have Yinvented r-new `and useful Improvements in .Time-Controlled -Switch'Mechanism vfor Electric Circuits, of ,-Whichthe following 'is a specification.

means `for periodically operating anelectric circuit -or circuits and .means for arresting said .periodic operation at'intervals.

yA further object is'to provide a circuit closing .and opening switch which .may .be operated fby la clockmovementas a motor for same and which will at .the same 'tune be .comparatively powerful, devoid of small delicate parts, contactsyetc., and which wi not require -a -fine adjustment .and "will not readily become .out .of adjustment.

Further it is -anobject toprovide. a switch which will .give a '-.positive metallic contact on closingI the 'circuit' and have :a substantial and-durable means fcrbreakin'g the circuit `between auxiliary .bloeks'of carbon orother suitable material after thefmetallic contact from an-ordinaryclock. movement will be sufficient tooperate-it.

f1t-isfurther an object togprovide a switch in -whiclrthe metallic contact members may .be readily shifted lto present new Contact surfaces should accidental arcing and burningfinjure thefones in use.

.1t-is. a .further object Atoprovide .a switch opening Jande-losingmechanism which-may be driven bynnsordinary clock fmoveme'ntto close .and open a vcircuit `.periodically and have Iincorprmated in its rconstruction -a means -wherebyzt/may be made to automatioelty render the 'switch inoperative during :Specication of aetters Patent Patented Marx?, t915.

4any predetermined number of .periods of time. I

Further objects of 'my invention will-ap- .pear in .the 4.following specification .and in :the accompanying :drawings and will lie set forth more yspecically in the subjoined claims.

In the .said drawings, which .show the preferred embodiment of my invention, and which are made fa `part of .this specification,

lfigure l is "a frontvelevation of .tlie'invention. ig. 2 is a side elevation thereof. Fig. 31s a .top plan'view, showing partof .the frame broken away. lFigd isfa horizontal section and' plan viewta-ken approxlmately ontheline 4-4cof Fig'. l andlook- .ing inthedirectionindicated by the arrows.

Fig. :Slis aside Yelevation of that part ofthe inventioneshown abovethe line -i in Fig. l. fFig. 5 .is .a similar view showing the working parts in adiiferent position. Fig. 17v is.4 a .detent forming part-of .the invention. -Eig. Sshows a portion of the detent #and la shift -lever inconjunction with it.

.My invention is welladapted to lee used incconjunction withan electrically operated .time yrecording register for the f purpose =of .closing und opening an electric-circuit thereto ,periodically vThe time recording :registers with Wliichziny device is well adapted to cooperate aredesigned: ordinarily for use only during those hours of .the day when employees Vare at work, ,and `the :register liept by these .time recording .registers is not kept-internisof hours an rminutes but inzterms of a certain number oftirne periods, generally tenths of hours. it ds, therefore, desired .to 'actuate 4these time recording registers once .every tenth yof en hour during these .portions of fthe day vwhen employees iarevatwork. vThese portionsof theday .vany 4under different Vworlririgsgf conditions, and any Adevice is -madesuciently adjustable ytota-1re care of these variations. -Withthese andother obje/cm in view I provide a-framewor -tor-my devicefcomprisinfg two 'vertical :strips l0ffand 10a* disposed somewhat apart in;pax'a1lelplanes,=and rigidly held :in such .position `lcy shouldered bolts Vlll and l2 connecting -theiupper aand loweradjacent` ends of the stripsrl' andfl, Upon the strip 10.0f the frameworkaand intermediate the :ends'thereof .is mounted :at

right angles a strip 13 in a plane arallel to that of the strip 10 and bearing adljacent one of its ends a horizontal shelf 14. A somewhat similar strip 15 is mounted upon the stripl()a in a similar manner but nearer the upper than the lower end thereof. There is also mounted upon the strip 10a a short strip 16 adjustably secured to the strip 10a by the cap screwf 16a. Preferably this Vwhole framework is fastened to the same post 25 threaded at its outer end. Upon this post 25 is mounted the female portion of an adjustable-circular knife switch comprising two disks 26 and 27 concentrically and loosely mounted upon the post 25, and spaced apart by a collar 28 of smaller diameter and beveled at their peripheries on their adjacent sides. Another collar 29 separates the disk 26 from the arm 24, and acts as a stop.. -Upon the threaded outer end of the post 25 is mounted a threaded nut 30. The two collars and two disks just described are held in position by an elastic member 31 in the form of a coil spring interposed between the nut 30 and the outer side of the disk 27. By rotation of the nut 30 on the post 25 the tension of spring 31 may be varied and the force with which the disks 26 and 27 are held in position may be increased or diminished at will. The arm 23 is slotted as at 32. :Rigidly mounted upon the-cross strip 15 of the framework is a bumper block 33 of insulating material bearing two upright posts 34 and 35. Post 34 engages slot 32 of the arm 23 to prevent horizontal movement therein. AUpon the opposite end of arm 23 is disposed at right angles andin an approximately vertical plane an odset arm 36 carrying a block 37 of carbon or other electric conducting material. A block 38 of insulating material is mounted upon the strip 15 of the framework and carries two binding posts 39 and 40 adapted to receive and hold the terminals 41 and 42 of an electric circuit'. Electrical connectionn between the binding post 39 and the arm 23 is had by means of an -electrical conductor indicated at 43. Mounted intermediate its ends upon the upper surface of the insulating block 2l is an elon ated electricity conducting switch arml 44 joined for electrical communication with the binding post 40 by Aan electric conductor 45. The arms 23 and 44 lie appromimately parallel and approximately in the same plane, except that that end of the 'arm 44 adjacent the female portion of the knife switch mounted on the arm 23 is bent upward in such manner that when the opposite ends of the arms 23 and 44 lie approximately ,in the same plane the switch end of the arm 44 will be above the switch end of the arm 23 and spaced therefrom, as shown in Fig. 5. The raised end of the arm 44 carries a depending arm 46 upon which is concentrically mounted in an approximately vertical plane a'third disk 47, constituting the male portionof the circular knife switch whose female portion was described above as disposed on the adjacent end of arm 23. Disk 47 is slightly beveled at each edge of its periphery to facilitate its entrance between the disks 26 and 27 of the female portion carried at one end of the arm 23. Upon the lower surface of the upbent portion of the arm 44 is fastened a depending guide member 48 offset at its lower end to be approximately parallel to the arm 44, the offset portion of this guide member being adapted to contact with insulated bumper block 33. The lower portion of this member parallel to the arm 44 is slotted as at 48a for insertion on guide post 35. Fastened upon the upbent end of the arm 44and adjacent the guide 48 is a weight 49. v A portion of the opposite end of the arm 44 is bent down approximately at right angles to form a shoulder 50; Upon vthe under surface .of the arm 44 and intermediate the insulatingr block 21 and the shoulder 50 is mounted amember 51 having two depending arms which support the ends of a small shaft 52. Pivoted by one of its ends to the shaft 52 is an auxiliary arm 53, which extends outwardly approximately the same distance as the adjacent end of arm 23, and has a downwardly depending shoulder 54 which carries a block 55` of cari bon or other electric conducting material. The auxiliary arm 5 3 is slottedintermediate its ends. A depending post 56 is fastened .to the arm 44 intermediate the shoulder 50 and the depending member 51 and engages the slot in the auxiliary arm 53. The Vlower end of the post 56 is threaded and carries a threaded nut 57. The auxiliary arm 53 is removably held in contact with the shoulder 50 by means of a compress spring 58 interposedbetween the nut 57 and the arm 53.

The two blocks 37 and '55 are disposed one ilo . meegaan as arm 59,'.but' being slightly'longer. Infthie preferred embodiment 'of the 'invention -the difference in forward extensionI of these two arms is approximately one oneihundredth of an'inch.

Mounted -in thelstrips 10and 10a -of'the framework -is a horizontal operating =shaft -61 extending -both forwardly fand rearwardly ofthe frame. rliheirear endof -this 'shaft carries la crank `62 and la crank pin 63. `In Fig. 2 reference -Anumeral 18, as stated above, represents an ordinary -clock movement. The minute arbor of this clock is indicated at64 and impartsfits'movement to 'the operating shaft l61, preferably by means -of a slotted arm 654 the-'slotted end of which'engagesthe crank pin'63. Thus, it vwill be 'seen that the clock indicated at 18 turns the shaft61 upon its axis atfa uni- 20 form speed to make one revolution every hour. Frictionally mountedu onithelshaft 61 by means of a relativelysti 'elastic member Glaand directlytbelowfthe-arms 59 and 60 isa -ratchetwheel 65 bearing, :inthe preferred `embodiment of 'my invention, ten ratchet points 65a. The *motive powfer'of the clock indicated 'at 18 isnot sufficient to overcome the friction of the mounting of the wheel 65, the lfriction being present merely for the purpose 'of adjusting the ratchet wheel-65 yon the shaft 61. 'It'will be noted that the blocks 21 and 22= are pivotally mounted upon ythe horizontal post 2O and thatfall theparts describedas beingfastencd 85 to the insulating blocks-21'and 22 are capable of relative oscillation with respect to the post 20. This relative oscillation is limited in its'downward directionby the arms 59 and 60 which come in contact with the 40 ratchet wheel 65, and bythe arm 23 which comes incontact -with the-bumper block 33, and by the guide 48 fastened'to the arm 44 which also comes'in contact with the-bumper block 33. A horizontal'post -66 is set in the cross strip 15 'of :the fframework and extends out over the `arms 59 and 60 to arrest'their oscillation inthe upwarddirection. Let it be noted -that 'the wheel 65 is of sulicient 'width to be disposed below both the arms 59 and 60, and lthat the ratchet points 651'are adapted-to'raise the-arms 59 and 60 and let-themdropseparately owing to their difference in length as the wheel is rotated -upon theoperating shaft 61: A 55 pinion 67 is concentric with 'and'secured to the ratchet wheel65 and rotates with it,' and, through atrain of gear wheels67, 67", 67, conveys the motion of the'shaftl to a cam shaft 68-mounted inthe Aframe -strips 10 and 6o 10a. The'bearing lfor'the wheels67* and 67b is mounted'uponthestrip 116'of the frame. The shaft-68 by meansfof therelation of the gears inthe-train of Wheels67, 67b,'and 67 is made'toturn' atal uuiform'speed one revolu- 65 tion every twenty-four hours. Upon Athe thefcam `wheel 69 or through slots 76 in the cams themselves. The cams are "so curved 'as to be concentric with the shaft 68 andthe wheel 69, andthe cams 7 O, 71, 72,-and 73, so aredetermined in their concentric position by `studs 78 which protrude from their sides and liein contact with the periphery ofthe cam wheel 69. The cam 77 is disposedon the forward -or outer surface of the'circu- 85 larplate 69 and spaced therefrom by means of a collar 79, and may be determined inits lconcentric position in any suitable manner.

Cams 70,71, 72, and 73 are in Contact with the circular plate 69 and disposed on either 90 side of it as convenience of adjustment necessitates. The space between the cam 77 and the circular plate 69 is as great or greater than fthe thickness of either of the cams 70, 71, 72, and 73.

-Horizontally secured to the strip 10 of the frame and preferably disposed'adjacent-the periphery of the circular plate 69 is a tubular bearing 80 engaging a horizontal `shaft 81 to which is fastened a Swingin `detent lever comprising two 'relatively a justable portions 82 and 83. The shaft Slis free-to rotate in the bearing 80 and also free fto slide therein. The part 82 of thedeten't lever'is rigidly attached to the shaft 81, but the part 83 is'pierced as at 8311 ffor 'pivotal engagement -with vthe shaft81. The part 83 of the detent lever is also slotted as at 84 and through the slot passes a cap screw 85,

which engages a threaded perforation in the 11' part 82 of the detent lever. Upon-the end of the part 83 opposite to the-end pierced as at 83a is fastened aweight 86. Rigidly fastened 'to the part 83 of the detent lever and extending forwardly therefrom is a post 87 having two attened portions forming an edge as at 87, and adapted'to ride upon vthe cams 70, 71, 72, 73, and 77, "the cams being beveled off at the ends which first come in contact with the post 87 in order to facilitate the action of post '87 in mounting the cams. The part 82 of the'detent lever is preferably cur-ved as 'at 82* around the operating shaft 61 tc avoid conf tact therewith and extends above the operating shaft 61 to a point approximately at the upper level of the ratchet wheel 65 and its ratchet points 65", where it is notched as `at 88 iforengagelnent with the arm 59. The detent lever 'carrying the above `described 1:30

attached parts is adapted to be shifted 'forward and backward by a shift lever 89 (see Fig. 8) which lies uponthe shelf .14 and is -pivoted thereto by a rivet 90 bearing a head and' having an elastic member 91 of considerable stiffness interposed between the head of the rivet and the upper surface of the shift lever. The outer end of the shift lever 89 is preferably upturned as at 92 for convenience in operating. The inner end -of the shift lever 89 is similarly upturned as at 93 and slotted for engagement with the part 82 of the detent lever. To prevent the detent lever being swung into contact with the ratchet wheel 65 a post 95 is set uprightly in thev shelf 14 which serves to arrest the motion of the shift lever before the part 82 of the detent lever touches the ratchet wheel 65. To avoid shifting the part 82 of the detent lever so far forward as to clear the forwardv side of the arm 59 the upturned end 93 of the shift lever 89 is made broad enough to contact with the strip 10 beforethe part 82 has shifted too far forward. It is preferable but not essential that thedetent lever be constructed of two parts as 82 and 83. For convenience in indicating the time of day I have shown mounted upon the operating shaft 61 a minute hand 96, a pinion 97 and a train of wheels 98, 499, and 100 operating an hour arbor`l01 and an hour hand 102, the wheels 98 and 99 being in any convenient manner journaled by means of an attachment on the strip 10 of the frame, and for further convenience in indicating the time of day l have shown three posts 103, 104, and 105, adapted to secure a clock dial if such be desired.

rhe electric circuit by which the above mentioned time recording registers are operated' and which it is desired to close periodically during given portions of the day is represented by the terminal wires l41 and 42. ln my construction l have shown both a Contact through a circular knife switch and a contact through two blocks 37 and 55. rlhe circular knife switch is used for the purpose of making a positive Contact between the arms 23 and 44 when the circuit is closed and the blocks 37 and 55 are used to close the circuit just ahead of the action of the knife switch and to break the circuit just after the break in the knife switch; in other words, to take the arc which is genorally present in making and breaking elec-L trical contacts. The closing of the electric circuit in my device is determined by relative motion of the arms 23 and 44, which is in turn determined by the rotation of the l *incasso their operation being purely mechanical. As they rise together upon one of the ratchet vpoints 65 they carry upward the two arms 23 and 44 which are out of contact for the reason that the arm 44 is upbent and that by-reason of being somewhat shorter than the arm 60,l is the first drop from the ratchet point. Its action in thus dropping off is facilitated by the weight 49 and as it drops offl and carries down with it the arm 44, the disk 47 upon the arm 44 drops between the disks 26 and 27 upon the arm 23, making electrical contact between the arms 44 and 23. The blocks 37 and 55 at the op- .posite adjacent ends of the arms 44 and 23 are so adjusted that they come into contact just before the two parts of the knife switch come into Contact. The vdiiference in length of the arms, 59 and 60 is preferably very slight, thereby admitting of a very few moments of electrical contact between the arms 23 and 44, for the continued turning of the ratchet wheel 65 causes the arm 60 to drop from one of the ratchet points 65a. very shortly after the arm 59 has dropped therefrom. The dropping of the arm is facilitated by the weight of the female portion of the knife switch mounted upon the arm 23 and when both the arms 59 and 60 have fallen off one of the ratchet points a into the hollow between the ratchet points the arms 23 and 44 have resumed the same relative position which they had when both were mounted upon the highest crest of the ratchet point. In other words, the arms 23 and 44 separate the instantfthat the arm 60 falls from one of the ratchet points to its normal position beside the arm 59, this separation breaking all electrical contact between thearms 23 and 44 both at the knife switch and through the blocks 37 and 55, the break however between the blocks coming subsequent to thev break in the knife switch. In the present embodiment of my invention the ratchet wheel 65.a makes a complete revolution every hour and having ten ratchet points the electric circuit is therefore closed and opened once every tenth of an hour. rlhe arm 59 is of sufficient width both to ride upon the ratchet wheel 65 and to entend forwardly therefrom to admit of engagement with the notched portion 88 of the detcnt lever in any of the diiferent shifted positions of the detent lever. To admit of the periodicai closing and opening ofthe electric circuit, the part 82 of the detent lever must be held away from contact with the arm 59, which is accomplished by the riding of the post 37 upon message theva'ricus cabins mounted `on the' circular Wheeloil. YWhen it is' desired that the electrical circuit shall remain open during a portion ofthe tvventyfour hours, such for instance, astlie night period from cessation ofworlrinthe afternoon to the resuming of Worin-the next morning, the cams ontiie cam Wheel 69, are spaced apart from eachother and intothis space the'ri'gid post 87 drops, which dreppingthrows'the detent lever up against 'thefr'ee end of the arm 59, and when the arm 59has risen nearly`to the maximum height of one ofthe ratchet points 65a the notched portion i558 of the detent 'lever engages the'iireeend-of'tbe' arm 59 and 4arrests its oscillation, 'While the arm 60 idles on the ratchet Wheel. The throwing forward of the detent lever is facilitated by the 'Weight 86. lliheii it is desired tov resume the periodical closing ofthe circuit during the night period 'above mentioned, the shift lever is operated to shift the datent lever forward suiiiciently'to'cause'th'epost 87 to mount and ride upon the` cam 77,'it being remembered that 'the cam i7 is spaced forward of the circular plate oil'and'the cams 70, 71,72,

and 73, so that Without this shiftingof the detent lever and the rigid post 87 the post 87 would lie ivitliin'the outer cam vperiphery and back `ci the cam 77. lhe mounting of the joost? uponfthe cam ''tlirows the detent lever out oi lcontact 'with the tree end oftliearm 5t, allowing the switch arms to resume their periodical closing and opening of' tile electrical circuit..

l claim:

l. The combination with a clock; an electric switch device comprising two pivoted insulated members interposed in the circuit, and'inale'and 'female members carried upon adjacent endsfoi said insulated members and adapted to'contactto close the circuit and to vseparate to open the circuit; time-controlled means igor periodically causing said closing land opening oii'tlie circuit compris ing anloperating shaft driven by the clock, a 'ratchet 'Wli'eel mounted :upon said lshaft and rotating therewith, a plurality of rider arms secured to the pivotedinsulated'members and adaptedto ride upon said ratchet *wheelto ,actuate the switch device; and time 'controlled means tor arresting said'pericdic closing and opening of the circuit during predetermined intervals.A

` The combination with a clock; an electric switch device 'comprising two pivoted insulated 'members linterposed in Ithe circuit, .and male and lfemale members carried upon adjacentjends'ii said insulated members and adapted to contactto 'closeth'e circuit and to separate yto open the circuit; time-controlled means for Yperiodically causing said closing and opening of the circuit vconigfnrising an operatingsli'aft driven by the clocks, a. ratchet i'vheel mounted'upon said shaft and rotating therewith, lajilurality of rider -secured to the pivoted insulated members and adapted to ride upon said' ratchet Wheel to actuate the switch device; and time-controlled means for arresting said periodic closing and' openmg of the circuit during predetermined intervals, comprising a pivoted detent, al rider post securedito-thedetent adjacent one end thereof, 'a cam Wheel Eadapted'to rotate at a uniform speed and impart movement to said detent, the .detent being adapted by said movement to engage one of said rider arms and withhold the male and female members from contact.

3. The combination ivith 'an electric circuit of a switch device'comprising tivo insulated i members pivoted `inter-me'dia'te Vtheir extremities, interposed 'in the circuit adjacent each other, carrying'on 'two of their adjacent extremities a knife switch and on their opposite adjacent extremities a makeand-break'of carbon or other 'electricity con-v ducting material, said insulated members being adapted to close and open said circuit by the contact and separation oftheir' adjacent extremities, time controlled means for periodically operating said insulated members-to close and opensaid circuit, and time controlled means [for arresting said periodic closing and opening during predetermined intervals.

e. 'llie combination with an electric circuit or" a switch devicecomprising two insulated members vinterposed in the circuit adjacent each other, carrying on tivooi their adjacent extremities a knife switch and on their opposite 'adjacent estremitie's "a maireand-breair oi carbon or other electricity cohducting material, "said 'insulated members being adapted to close and'open said circuit by the contact and sebarati'on of their 4adjacent extremities, time controlled means for periodically operating said insulated niembers to close and open 'said circuit and time coritrolledmeans igor arresting said periodicl closing and opening during .predetermined intervals.

5. The combination in an'electric 'circuit of aswitcli comprising a plurality of' switch arms adapt'edby 4the contact and separation of their adjacentends to close and openen electric circuit, a plurality oiirider 'armstelio,

'iba

iis

cured to and insulated from "said svv'itch j arms and adapted to vimpart relative more ment to said switcharms tcfcause their ad jacent endsto come into Contact and'to sepa rate, time coiitroiledifi'ean's :tor periodically causing the said Contact' 'and separation, 'and time controlled .means for arresting 'said periodic ciosingand opening'during predetermin'ed intervals.

6. A switch 'forelect'ric circuits combining a plurality of switch arms adapted to. close and' open a'n electric circuit their contact and sparation, a plurality of rider armsof iso difering lengths respectively secured to and vinsulated from said switch arms, time controlled means for periodically imparting relative movement to said rider arms, and time controlled means for arresting said relative movement during predetermined intervals, comprising a detent bearing a rider post,land a cam wheel bearing adjustably and concentrically mounted cams protruding beyond its periphery, said wheel being adapted to rotate ata uniform speed and impart motion through said rider post to said detent.

7. A switch for electric circuits combining a plurality of switch arms adapted to close and open an electric circuit by their contact and separation, a plurality of rider arms of differing lengths respectively secured to and insulated from said switch arms, time controlled means for periodically imparting relative movement to said rider arms, comprising a ratchet wheel adapted to rotate at a uniform speed and to carry said rider arms and impart relative movement thereto, and' time controlled means for arresting said.

relative movement during predetermined intervals comprising a detent and an adjustable cam wheel adapted to engage said detent with one of said rider arms during said predetermined intervals. j

8. The combination of a switch for electric circuits; time-controlled means for periodically closing and opening said switch; and time-controlled means for arresting said periodic closing and opening during predetermined intervals; said switch comprising two switch arms, ymale and female members carried upon adjacent ends thereof and adapted by their .contact to conduct electricity, the opposite adjacent ends of the switch arms carrying a j make-and-break adapted to close an electric circuit before the contact of the male and female members and to open the circuit after the separation of those members; said means for periodically closing and opening the switch comprising two rider arms secured to said switch arms and adapted to operate said switch arms by relative movement, a time-controlled ratchet wheel adapted to rotate at a uniform speed and impart relative movement to the rider arms; said arresting means comprising a pivotallymounted detent, a time-controlled cam wheel bearing concentric cams protruding from its periphery, to said detent adjacent one extremity therelofIanc adapted to ride upon said cams and to fall therebetween d urmg said predetermined intervals and to carry said detent into engagement atits opposite end with one of the rider arms said relative movement during said intervals.

9. 4The combination of a switch for 'electric circuits, a-make-and-break foi-proteca rider post attached' to withhold that arm from tion of said switch from arcing, time-controlled means for periodically operating said switch comprising an operating shaft adapted to rotate one revolution each hour and bearing a ratchet Awheel flexibly mounted thereon, having a plurality of ratchet point-s, means in engagement with said ratchet points for imparting relative movement to said switch arms, a detent adapted by its movement to arrest said closing and. opening during predetermined intervals, a cam wheel, means for imparti/ng the motion of said operating shaft to saidV cam wheel to rotate it one revolution in twenty-four hours, and a rider post upon said detent adapted to ride vupon said cam wheel and impart said moveof said switch from arcing,time-controlled means for periodically operating said switch comprising an operating shaft adapted to rotate one revolution each hour and bearing a v ratchet wheel flexibly mounted thereon-- having a plurality of ratchet points, means in engagement with said ratchet points for imparting relative movement to said switch arms, a detent adapted by its movement to arrest said closing and opening during predetermined intervals, a cam wheel bearing concentrically mounted adjustable cams protruding beyond its periphery, means for imparting the motion of said operating shaft to said cam wheel to rotate it one revolution in twenty-four hours, a rider post upon said detent adapted to ride upon-said camsand to fall between them during said predetermined intervals and thereby impart said movement to ,said detent.

11. The combination of a switch vfor electric circuits, means for periodically closing and opening said switch, a detent exibly mounted and adapted. by its movement to arrest said periodic closing and opening, means for operating said detent comprising a time-controlled cam wheel adapted to rotate onerevolution in twenty-four hours, a plurality of adjustable cams secured thereto concentric therewith and forming a broken outer periphery upon said cam wheel, a

rider post secured to said detent and adapted to ride upon said outer periphery andtto fall into the broken portions therein, thereby imparting said movement to said detent.

12. The combination of a switch for electric circuits, means for periodically closing and openingl said switch, a detent iexibly mounted adapted by its movement to arrest said periodic closing and opening, means for operating said detent comprising a timecontrolled cam Wheel adapted to rotate one revolution in twenty-four hours, a plurality of adjustable cams secured thereto, concentric therewith and forming a broken outer periphery upon said cam wheel, a rider post secured to said detent adapted to ride uponA 'movement to said detent, one of said cams being spaced from said cam Wheel suiiiciently to clear said rider post and means for shifting Vsaid detent and rider post to' engage said spaced cam comprising a shift lever pivoted intermediate its extremities and in liexible engagement with said detent.

13. The combination in switch mechanism for electric circuits of aswitch, time-controlled means for operating said' switch periodically, time-controlled means'for rendering said switch operating vmeans inoperative during predetermined intervals, and manually operable means 'for rendering Vsaid switch operating means operable during said predetermined inoperative intervals;

14. The combination ,of a switch for eleotric circuits, time controlled means for peri-y `odically closing and opening said switch,

time controlled means for arresting said periodic closing and opening during prede- -termined.intervals, and means for causing said periodic closing and opening at will .during said predetermined intervals.

15. The combination with an electric circuit ot a switch,` time-controlledmeans Afor periodically closing and opening said switch; means for arresting'said periodic closing and opening during predetermined intervalscomprising a detent pivotally and slidably mounted and adapted by pivotal movementv to arrest the operation 'of said switch closing and opening means, a rider post 'fixed upon one extremity of the detent,

a time-controlled cam wheel adapted to impart said pivotal movement to the detent; and means( for causing apres'umption of the operation of said switch closing and opening means during normally inoperative in- .means for arresting said periodic operation during predetermined intervals.

' 17. The combination of a clock movement,- an hour cam wheel mounted on the center arbor thereof, a day cam wheel geared to said hour cam wheel to rotate at a lesser speed than the hour cam wheel, a switch for electric circuits actuated periodically by said hour cam wheel, and mechanism actuated by said day cam wheel and operatively related to said switch for arresting said periodic actuation during predetermined in'- tervals.

In testimony whereof I have signed my` name to this specification, in the presence of two subscribing witnesses, on this 8th day of October A. D. 1912.

HORACE B. McCABE.

Witnesses: HAROLD G. Rocxwnnr., CHARLES H. SEEM. 

